/* This software is licensed by the MIT License, see LICENSE file */
/*                                Copyright © 2022 Gregory Lirent */

#include "__internal/assert.h"
#include "__internal/include.h"

#define max_align _Alignof(max_align_t)
#define max_size ((sizeof(ldbl_t) >= 8) ? sizeof(ldbl_t) : 8)

/*#####################################################################################################################*/

static vtype normalize_value(u64_t* d, const void* v, vtype t) {
    if (t == VTYPE_BOOLEAN || t == VTYPE_UINT8) {
       *d = *(u8_t*)v;
        t = VTYPE_UINT64;
    } else if (t == VTYPE_UINT16) {
       *d = *(u16_t*)v;
        t = VTYPE_UINT64;
    } else if (t == VTYPE_UINT32 || (sizeof(void*) == 4 && t == VTYPE_POINTER)) {
       *d = *(u32_t*)v;
        t = VTYPE_UINT64;
    } else if (t == VTYPE_UINT64 || (sizeof(void*) == 8 && t == VTYPE_POINTER)) {
       *d = *(u64_t*)v;
        t = VTYPE_UINT64;
    } else if (t == VTYPE_INT8) {
       *d = *(s8_t*)v;
        t = (*(s8_t*)v >= 0) ? VTYPE_UINT64 : VTYPE_INT64;
    } else if (t == VTYPE_INT16) {
       *d = *(s16_t*)v;
        t = (*(s16_t*)v >= 0) ? VTYPE_UINT64 : VTYPE_INT64;
    } else if (t == VTYPE_INT32) {
       *d = *(s32_t*)v;
        t = (*(s32_t*)v >= 0) ? VTYPE_UINT64 : VTYPE_INT64;
    } else if (t == VTYPE_INT64) {
       *d = *(s64_t*)v;
        t = (*(s64_t*)v >= 0) ? VTYPE_UINT64 : VTYPE_INT64;
    }

    return t;
}

int libcdsb_vtype_compare_values(const void* s0, vtype t0, const void* s1, vtype t1) {
    if (t0 == t1) return libcdsb_vtype_compare_values_eq(s0, s1, t0);

    if (is_integer(t0) && is_integer(t1)) {
        u64_t v0, v1;

        t0 = normalize_value(&v0, s0, t0);
        t1 = normalize_value(&v1, s1, t1);

        if (t0 == t1) {
            if (t0 > VTYPE_UINT64)
                return (s64_t)v0 - (s64_t)v1;
            return v0 - v1;
        }

        return t1 - t0;

    } else if (is_float(t0) && is_float(t1)) {
        ldbl_t v;

        if (t0 == VTYPE_FLOAT)       v = *(fl_t*)s0;
        else if (t0 == VTYPE_DOUBLE) v = *(dbl_t*)s0;
        else v = *(ldbl_t*)s0;

        if (t1 == VTYPE_FLOAT)       v -= *(fl_t*)s1;
        else if (t1 == VTYPE_DOUBLE) v -= *(dbl_t*)s1;
        else v -= *(ldbl_t*)s1;

        if (v < 0) return -1;

        return (v > 0) ? 1 : 0;
    } else return t0 - t1;
}

/*#####################################################################################################################*/


int libcdsb_vtype_compare_values_eq(const void* s0, const void* s1, vtype t) {

    ldbl_t v[1];

    if (s0 == s1)
        return 0;

    switch (t) { default: abort();

        case    VTYPE_INT8: return  *(s8_t*)s0 -  *(s8_t*)s1;
        case   VTYPE_INT16: return *(s16_t*)s0 - *(s16_t*)s1;
        case   VTYPE_INT32: return *(s32_t*)s0 - *(s32_t*)s1;
        case   VTYPE_INT64: return *(s64_t*)s0 - *(s64_t*)s1;

        case VTYPE_BOOLEAN:
        case   VTYPE_UINT8: return *(u8_t*)s0 - *(u8_t*)s1;

        case  VTYPE_UINT16: return *(u16_t*)s0 - *(u16_t*)s1;
        case  VTYPE_UINT32:
                      u32_: return *(u32_t*)s0 - *(u32_t*)s1;

        case VTYPE_POINTER: if (sizeof(void*) != 8) goto u32_;
        case  VTYPE_UINT64: return *(u64_t*)s0 - *(u64_t*)s1;

        case VTYPE_LDOUBLE: *(ldbl_t*)v = *(ldbl_t*)s0 - *(ldbl_t*)s1;

                            if (!*(ldbl_t*)v)
                                return 0;
                            return *(ldbl_t*)v < 0 ? -1 : 1;

        case  VTYPE_DOUBLE: *(dbl_t*)v = *(dbl_t*)s0 - *(dbl_t*)s1;

                            if (!*(dbl_t*)v)
                                return 0;
                            return *(dbl_t*)v < 0 ? -1 : 1;

        case   VTYPE_FLOAT: *(fl_t*)v = *(fl_t*)s0 - *(fl_t*)s1;

                            if (!*(fl_t*)v)
                                return 0;
                            return *(fl_t*)v < 0 ? -1 : 1;

        case  VTYPE_STRING: return string_compare(s0, s1);
        case   VTYPE_ARRAY: return  array_compare(s0, s1);
        case    VTYPE_LIST: return   list_compare(s0, s1);
        case     VTYPE_MAP: return    map_compare(s0, s1);
        case     VTYPE_SET: return   vset_compare(s0, s1);
    }
}